A multi-level cooperative control method based on active pointing ultra-quiet platform

Abstract

A multi-level cooperative control method based on an active pointing ultra-quiet platform, which is suitable for astronomical observation, high-resolution earth observation and other fields with load ultra-high-precision determination requirements. On the basis of the two-stage control system of the star attitude control system and the fast mirror, a super-static platform with pointing function is installed between the spacecraft star and the payload, which is composed of a first-level star attitude control, a second-level load attitude control and a three-level load attitude control system. A three-level control system composed of a fast-swing mirror. High-precision control of the desired attitude is achieved. Aiming at the three-level composite system of the new spacecraft platform, the present invention proposes a multi-level cooperative control method based on the active pointing ultra-static platform, and designs the three-level system control law of the first-level star, the second-level load and the fast-reflecting mirror; in order to meet the system response requirements On the premise of , multi-stage and multi-bandwidth composite control is realized, which solves the problem of cooperative control between the star, the payload, and the fast mirror.

Description

technical field [0001] The invention belongs to the field of attitude control of spacecraft, and relates to a multi-level cooperative control method based on an active pointing ultra-quiet platform. Background technique [0002] Attitude tracking control is an important problem in the field of spacecraft control, and the demand for high-precision and high-stability attitude tracking control in engineering practice is increasingly urgent. Existing high-precision attitude tracking systems usually adopt a composite control strategy of rough tracking + fine tracking. By using the wide-angle measurement sensor to search for the target and roughly track the expected attitude, the narrow-field imaging closed-loop locks the target, and the high-bandwidth fast-swing mirror realizes closed-loop adjustment. Composite control requires two or more control systems to be implemented in series. [0003] The coarse tracking of the James Webb Telescope for astronomical observations is mainl...

AI Technical Summary

Problems solved by technology

[0004] On the one hand, constrained by the torque output and the large inertia of the whole star, the attitude control bandwidth of the star is low, the error of tracking and aiming is large, and there will be a long stabilization time at the end of the maneuver. Requirements, leading to the contradiction between the size of the field of view and the measurement accuracy

On the other hand, multi-source vibrations on the star lead to low stability during the maneuvering and aiming process of the payload, and it is urgent to install a vibration isolation platform between the star and the payload

Images